The one on the left is what it looks like, the one of the right is more true to metro style for some reason the MS as self Areo there, its a great resoruce I see no need for it but or well.
You version looks much cleaner, but the reason they have their design is to show which window is active and which is in the background by making the border gray when not selected. But the other changes such as the button change would look great.